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2007 peterbilt 387 Gauges not working

Discussion in 'Trucking Electronics, Gadgets and Software Forum' started by ZELLA6711, Sep 8, 2022.

  1. Sep 8, 2022 #1
    ZELLA6711

    ZELLA6711 Bobtail Member

    1
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    Sep 8, 2022
    0
    All my gauges quit working. 2007 peterbilt 387. Electronic log won’t flip over to drive mode. If I unplug the speedometer everything goes back to normal except the speedometer and the ELD. Some friends say replace the speedometer head. I don’t know
     
    ZELLA6711, Sep 8, 2022
    ZELLA6711, Sep 8, 2022
    #1
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  3. Sep 8, 2022 #2
    aussiejosh

    aussiejosh Road Train Member

    4,655
    5,277
    Aug 28, 2009
    Airlie Beach QLd
    0
    If all your gauges have bit the dust its more than likely a fuse has blown.
     
    aussiejosh, Sep 8, 2022
    aussiejosh, Sep 8, 2022
    #2
  4. Sep 8, 2022 #3
    Six9GS

    Six9GS Road Train Member

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    Dec 3, 2012
    Yuma, AZ
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    We don't need no stickin' gauges! 20220908_172101.jpg
     
    Six9GS, Sep 8, 2022
    Six9GS, Sep 8, 2022
    #3
  5. Sep 8, 2022 #4
    Old Man

    Old Man Road Train Member

    4,597
    13,466
    Apr 3, 2009
    Oklahoma City, OK
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    Not sure on that model but a 379 has a relay behind the left dash panel, acothere are two, sit back to back. The smaller one closes the big one and it powers the gauges and other things, when going bad it doesn’t close completely and crazy things happen.
     
    Old Man, Sep 8, 2022
    Old Man, Sep 8, 2022
    #4
  7. Sep 9, 2022 #5
    Ridgeline

    Ridgeline Road Train Member

    20,727
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    Dec 18, 2011
    Michigan
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    You have a problem with the communications bus which runs the eld, speedometer and most of the gauges, if you unplug the speedometer and everything works than more likely than not it is a defective speedometer. You can get it repaired or buy another one - used are out there.
     
    Ridgeline, Sep 9, 2022
    Ridgeline, Sep 9, 2022
    #5
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